Chemical and Physical Properties of Matter Notes 7

Definitions of Properties Physical properties can be observed without chemically changing matter. Chemical properties describe how a substance interacts with other substances.

Examples of Properties PHYSICAL CHEMICAL Color Odor Phase Luster Shape Malleability Ductility Density solubility Reactivity Combustibility Flammability Rusting Corroding acidity

PROPERTIES Intensive A property that does not change when the amount of sample changes. Examples are density, pressure, temperature, color. Extensive A property that changes when the amount of matter in a sample changes. Examples are mass, volume, length, and charge

EXAMPLE Mass of water 100.0 g 10.0 g Volume of water 0.100 L 0.010 L Temperature of water 25 °C Density of water 1.00 g/mL

Density: mass divided by the volume of a substance Density = mass / volume Unit: g/ml or g/cm3 M D V

density of substance density of reference substance SPECIFIC GRAVITY Specific Gravity: has no units!! Specific gravity is the density of a substance relative to some reference substance: ( usually compared to water. Specific gravity = density of substance density of reference substance